Make ShaderTranslatorCache thread safe

gpu/command_buffer/service/in_process_command_buffer.cc

Index: gpu/command_buffer/service/in_process_command_buffer.cc
diff --git a/gpu/command_buffer/service/in_process_command_buffer.cc b/gpu/command_buffer/service/in_process_command_buffer.cc
index 71faba607c77c4312655e3dbead04ccfaec2118f..4f136b3e1c7b4738131ebba3e208148438fdafeb 100644
--- a/gpu/command_buffer/service/in_process_command_buffer.cc
+++ b/gpu/command_buffer/service/in_process_command_buffer.cc
@@ -73,11 +73,13 @@ class GpuInProcessThread
   virtual void ScheduleTask(const base::Closure& task) OVERRIDE;
   virtual void ScheduleIdleWork(const base::Closure& callback) OVERRIDE;
   virtual bool UseVirtualizedGLContexts() OVERRIDE { return false; }
+  virtual gles2::ShaderTranslatorCache* shader_translator_cache() OVERRIDE;
 
  private:
   virtual ~GpuInProcessThread();
   friend class base::RefCountedThreadSafe<GpuInProcessThread>;
 
+  scoped_refptr<gpu::gles2::ShaderTranslatorCache> shader_translator_cache_;
   DISALLOW_COPY_AND_ASSIGN(GpuInProcessThread);
 };
 
@@ -98,6 +100,12 @@ void GpuInProcessThread::ScheduleIdleWork(const base::Closure& callback) {
       FROM_HERE, callback, base::TimeDelta::FromMilliseconds(5));
 }
 
+gles2::ShaderTranslatorCache* GpuInProcessThread::shader_translator_cache() {
+  if (!shader_translator_cache_.get())
+    shader_translator_cache_ = new gpu::gles2::ShaderTranslatorCache;
+  return shader_translator_cache_.get();
+}
+
 base::LazyInstance<std::set<InProcessCommandBuffer*> > default_thread_clients_ =
     LAZY_INSTANCE_INITIALIZER;
 base::LazyInstance<base::Lock> default_thread_clients_lock_ =
@@ -389,6 +397,7 @@ bool InProcessCommandBuffer::InitializeOnGpuThread(
   disallowed_features.gpu_memory_manager = true;
   if (!decoder_->Initialize(surface_,
                             context_,
+                            service_->shader_translator_cache(),
                             params.is_offscreen,
                             params.size,
                             disallowed_features,